VENA TECH-LGM FILTER - LONG-TERM RESULTS OF A PROSPECTIVE-STUDY

Efficiency and tolerance of the Vena Tech-LGM filter were assessed in 142 patients prospectively studied during a 2-6-year follow-up period. No patients were lost to follow-up, and 137 (91.3%) scheduled control examinations were performed. Fifty-three patients died of causes unre lated to thromboembolic disease. Pulmonary embolism was suspected in f ive surviving patients (3.5%). Sixteen retractions (18.4%), 16 intraca val migrations (18.4%), and one tilt were observed. Filter patency stu died at Doppler ultrasonography, with or without phlebocavography, gav e the following results according to the Kaplan-Meier actuarial method : 92% patency after 2 years of follow-up, 80% after 4 years, and 70% a fter 6 years. Vena Tech-LGM filter obstruction was related to retracti on (P < 10(-6)) or distal migration (P < .004). Occurrence of trophic disease in the lower limbs during the follow-up period was related to the initial level of deep venous thrombosis (P = .03) and had no relat ion to the patency of the filter. The filter was effective in preventi ng pulmonary embolism, with 70% demonstrating long-term patency, and n o deleterious effects were imputed to obstructions observed during fol low-up.